Blackstone journeys north from South Africa to Rhodesia to help Vivian find her father. They find him a captive of Mr. Zurich, who is forcing the professor to develop weapons he can sell to the highest bidders. Blackstone wins a duel of magicians and helps the Trents escape.

When the statue of the lizard-lion tells the natives that they must bring all of their ivory to the temple Rex King decides to find out what is going on, as the tribe will starve without the ivory to trade for food.